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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Main LCD control signals are generated by MSM7227. Those signal’s path are :
MSM7227
Î
80-pin Main to SUB connector
Î
RGB converter
Î
60-pin LCD connector
Î
LCD Module
4. Trouble Shooting
(BB)
4.16 Main LCD trouble
The LCD works
START
Press END key
to turn the power on
Is the circuit powered?
Follow the Power ON
trouble shooting
LCD display OK?
Check TP1,TP2,TP3
No
Yes
Yes
No
Disconnect and reconnect
80-pin & 60-pin B to B
connector
Change the SUB BD
No
End
Yes
Display OK?
Yes
No
No
Change the LCD module
No
Change the Main BD
Yes
Display OK?
Yes
150P